HEAD PART OR8 CROWN RACE TWISTR 1.5to1-1/8 52/30 FOR 1-1/8 FORK 1.5` headset crown race with a 30mm inner diameter. Allows forks with straight 1-1/8a€? steerer tube diameters to be used in frames designed for tapered 1-1/8a€? to 1.5a€? steerer tubes. Compatible with headsets that have 1.5a€? lower headset bearing cups. Item Specifications: Size: 1.5` to 1-1/8` (52mm/30mm), Type: Crown Race, SHIS: Crown Race,